高强铝合金脉冲变极性等离子弧焊接头组织与性能

发布时间：2018-01-11 17:14

本文关键词：高强铝合金脉冲变极性等离子弧焊接头组织与性能　出处：《焊接学报》2016年11期 　论文类型：期刊论文

【摘要】：采用脉冲变极性等离子弧焊对厚度10 mm的7075铝合金进行焊接,利用光学显微镜、扫描电子显微镜、X射线衍射仪、万能拉伸试验机和显微硬度仪对焊缝的显微组织和焊接接头的力学性能进行了分析和测试,研究植入脉冲对焊接接头组织及力学性能的影响.结果表明,植入脉冲后焊接接头成形良好,由于高低频脉冲的周期性变化引起熔池液体强烈的搅拌作用,细化了焊缝的显微组织,强化相T相得到细化,提高了焊缝的抗拉强度和显微硬度,焊缝处的抗拉强度为397.9 MPa,约为母材强度的67.5%,比未植入脉冲时提高了5.13%,焊缝质量有所提高.
[Abstract]:7075 aluminum alloy with a thickness of 10 mm was welded by pulsed variable polarity plasma arc welding. The X-ray diffractometer was used to weld 7075 aluminum alloy with optical microscope and scanning electron microscope. The microstructure of weld and the mechanical properties of welded joints were analyzed and tested by universal tensile tester and microhardness tester. The effect of implanted pulse on the microstructure and mechanical properties of welded joints was studied. The welding joint formed well after the pulse implantation. The liquid of the weld pool was stirred strongly due to the periodic change of the high and low frequency pulse. The microstructure of the weld was refined and the T phase of the strengthened phase was refined. The tensile strength and microhardness of the weld are improved. The tensile strength of the weld is 397.9 MPa, which is about 67.5% of the base metal strength, which is 5.13% higher than that without the implanted pulse. The weld quality has been improved.
【作者单位】：内蒙古工业大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51365032) 教育部新世纪优秀人才支持资助项目(NCET-10-0908)
【分类号】：TG456.2
【正文快照】： 0序言高强铝合金以其高强、轻质、高韧、耐腐蚀等优良特性被广泛应用于航空航天领域[1].铝合金容易氧化,在焊接过程中需去除氧化膜.变极性等离子弧(variable polarity plasma arc,VPPA)焊技术具有焊后变形小,能量集中等优点.焊件不需开坡口、焊道窄,且单面焊双面成形,立焊时有

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